//
//  Atom.h
//  Firstclass
//
//  Created by Luck on 16/4/13.
//  Copyright © 2016年 yinjiao. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Atom : NSObject

@property (readonly) NSInteger protons;
@property (readonly) NSInteger neutrons;
@property (readonly) NSInteger electrons;
@property (readonly) NSString *chemicalElement;

-(NSUInteger) massNumder;

@end


